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start:
09 january 2007, up-date: 09 january 2007
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| III. The Third Discourse of al-Sharafiyyah |
| (The Addition, Division, Subtraction of the Intervals and the Formation of the Kinds) |
| 1. The Addition of The Intervals |
| 2. The Division of the Intervals |
| 3.The Subtraction of The Intervals From Each Other |
| 4.The Arrangement of The Intervals Within Tetrachord and Constituting The Kinds |
| 5.The Consonant and Dissonant of The Kinds |